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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 15, 2015 | Apr. 28, 2015 | Jun. 16, 2014 | Apr. 29, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Equity [Abstract] |  |  |  |  |  |  |
Dividend declaration date |  |  |  |  | Apr. 28, 2015 | Apr. 29, 2014 |
Dividend declared (in dollars per share) |  | $ 0.80 |  | $ 0.49 |  |  |
Dividend paid (in dollars per share) | $ 0.80 |  | $ 0.49 |  |  |  |
Dividends payable, date paid |  |  |  |  | Jun. 15, 2015 | Jun. 16, 2014 |
Dividends payable, date of record |  |  |  |  | Jun. 01, 2015 | Jun. 02, 2014 |
Number of shares authorized to be repurchased (shares) |  |  |  |  | 8,000,000 |  |
Stock repurchased during period, including unsettled shares |  |  |  |  | 2,200,000 |  |
Repurchases of common stock, including unsettled shares |  |  |  |  | $ 187.2 |  |
Stock repurchased during period (shares) |  |  |  |  | 2,000,000 |  |
Repurchases of common stock |  |  |  |  | $ (168.7) | $ (16.7) |
Stock repurchased but not settled |  |  |  |  | 200,000 |  |
Repurchases of common stock, unsettled shares |  |  |  |  | $ 18.5 |  |
Remaining authorized repurchase amount (shares) |  |  |  |  | 4,000,000 |  |
Remaining authorized repurchase amount, net of unsettled shares |  |  |  |  | 3,800,000 |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |
Foreign currency translation |  |  |  |  | $ (130.6) |  | $ (26.4)
Translation loss on net investment hedge, net of income taxes of $(4.6) and $(16.4), respectively |  |  |  |  | (3.6) |  | (24.5)
Translation loss on long-term intercompany loans |  |  |  |  | (52.3) |  | (73.4)
Unrealized gain on investments, net of income taxes of $3.4 and $3.7, respectively |  |  |  |  | 15.1 |  | 16.7
Accumulated other comprehensive loss |  |  |  |  | (217.7) |  | (155.2)
Translation gain (loss) on net investment hedge, tax |  |  |  |  | (4.6) |  | (16.4)
Unrealized gain on investments, tax |  |  |  |  | 3.4 |  | 3.7
Defined Benefit Pension Plans [Member] |  |  |  |  |  |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |
Defined benefit plans, net of income taxes |  |  |  |  | (50.6) |  | (52.1)
Defined benefit plans, tax |  |  |  |  | (29.5) |  | (30.1)
Retiree Health Care Plan [Member] |  |  |  |  |  |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |
Defined benefit plans, net of income taxes |  |  |  |  | 4.3 |  | 4.5
Defined benefit plans, tax |  |  |  |  | $ 2.3 |  | $ 2.4

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